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Some Statistics for Spirit & Oppy, As the journey continues on Mars
brellis
post Jul 3 2012, 07:24 PM
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Watching the Curiosity "Dune Buggy" vid got me wondering -- there are lots of examples of wheels spinning in the deep stuff without any actual forward progress. What's the record for a downhill slide by a MER? Could it have happened descending into Victoria Crater?
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RoverDriver
post Jul 3 2012, 10:23 PM
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QUOTE (brellis @ Jul 3 2012, 11:24 AM) *
Watching the Curiosity "Dune Buggy" vid got me wondering -- there are lots of examples of wheels spinning in the deep stuff without any actual forward progress. What's the record for a downhill slide by a MER? Could it have happened descending into Victoria Crater?


We did not skid that much in Duck Bay. There was one instance, sol 1305 I think, where we were driving cross slope around 20-25 degrees and we slid sideways unexpectedly. One instance where I remember we did skid was in the approach to the western rim of Santa Maria. We were doing a "K" drive (partly backwards, then do a K turn, AKA three point turn?, and then drive forward to the rim, can't recall the Sol # possibly in the 2500's. I was the RP and we did get unexpected skid in the backwards portion of the drive. It is also difficult to determine how much of the skid is due to actual skidding and what part comes from the fact that the wheel diameter is about 25 cm when driving on soft soil while it is 26.5cm when driving on bedrock (this drive was mostly on bedrock), the difference in diameter stems from whether you include the grousers or not.

AFAIK we never driven on terrain that is so steep to cause skidding. Skidding would be worse than 100% slip. When you skid you have completely lost control of the vehicle path. The closest Oppy got to become a rock hugger was Wopmay in Endurance Crater, but even then we were driving cross-slope and managed to drive away.

Paolo


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fredk
post Jul 3 2012, 10:58 PM
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Fascinating as always, Paolo, thanks. For the record, Santa Caterina was an area on the N rim of Victoria. Was it the approach to Santa Maria where she skidded/slipped?
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RoverDriver
post Jul 4 2012, 01:38 AM
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QUOTE (fredk @ Jul 3 2012, 02:58 PM) *
Fascinating as always, Paolo, thanks. For the record, Santa Caterina was an area on the N rim of Victoria. Was it the approach to Santa Maria where she skidded/slipped?


You are correct. I will edit my post. Thank you for pointing this out.

Paolo


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dilo
post Aug 17 2012, 07:43 AM
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Late update (vacations + MSL distracted me...):

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brellis
post Sep 1 2012, 05:46 AM
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Opportunity has surpassed 35km of travel - universetoday article
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the Opportunity rover keeps on trucking, and has now exceeded over 35 kilometers (21.75 miles) of driving on its odometer! Quite an accomplishment for the Energizer Bunny of Mars rovers, now operating for 3,057 Martian sols. As the MER team says, “Not bad for a vehicle designed for only about 1 kilometer (.6 miles) of distance and 90 sols (days) of lifetime.”
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dilo
post Sep 21 2012, 01:09 PM
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Update:


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climber
post Oct 4 2012, 10:57 AM
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Only numbers but well, another achievement: we just passed the 3000 sols after guarenty mark wheel.gif


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dilo
post Oct 12 2012, 05:09 PM
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Monthly update:
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Compared to previous martian summer, daily energy budget decreased by 10%; considering that Tau and dust factor were almost the same, this suggests further cells/battery degradation.
Not sure if this could jeopardize next winter survival but I guess she will need a very good orientation station point in order to stay above 250W/sol... rolleyes.gif


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fredk
post Oct 13 2012, 12:19 AM
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The problem could be calibration. We've seen that before. The tau and dust factor values they give need some model of the dust on the pancam lens. They periodically update that model. I'd be surprized if the batteries degraded that quickly, but who knows...
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dilo
post Nov 15 2012, 09:17 PM
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Monthly update:
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dilo
post Dec 26 2012, 08:38 AM
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Late Monthly update (purpose is to align it at the change of month, as per MSL):
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MoreInput
post Jan 15 2013, 10:42 PM
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Half yearly update of the Mars Rover Exploration Rover timeline.
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Need more input ...
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dilo
post Jan 19 2013, 04:30 PM
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Complete Odometry update based on MoreInput timeline.


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Ant103
post Jan 19 2013, 05:31 PM
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Excellent work smile.gif


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